VIENNA — New waves of acrimony between Iran and world powers over the Islamic Republic’s disputed presidential vote are dimming what were already modest prospects for meaningful negotiations with Tehran over its nuclear program.

President Barack Obama’s offer of direct U.S.-Iranian talks on nuclear and other issues still stands. But Tehran seemed uninterested in new negotiations even ﻿before already tense relations with the West became burdened by Iran’s crackdown on demonstrators protesting what they say was a skewed election in favor of President Mahmoud Ahmadinejad.

In a reflection of how unlikely any nuclear meeting has become, a senior Iranian official said Wednesday that the EU had lost the right to talk to Iran about its atomic activities.

The last meeting on the nuclear issue was a year ago. It ended within hours, with Iran spurning an offer by six world powers — Washington and the other permanent U.N. Security Council members plus Germany.

At the Geneva talks, the six offered to refrain from new U.N sanctions if Iran froze its uranium enrichment program. The tradeoff was designed to set the scene for in-depth talks the West hopes would end with Tehran agreeing to a long-term freeze of enrichment, which can make both nuclear fuel and nuclear warhead material.

Periodic contacts with Iranian officials by Javier Solana, the EU envoy acting as an intermediary for the six powers, have remained inconclusive since then, dashing hopes that Obama’s outreach — an offer of one-on-one talks with the Iranians — would break the deadlock.

Iran’s position remains the same: Its program is for peaceful purposes and it will not compromise on enrichment, despite three sets of Security Council sanctions and the implicit threat of more.

Chances of new talks diminished further Wednesday after a senior Iranian official was quoted as saying the EU had disqualified itself from such discussions because of its “interference” in the postelection unrest. Iran accuses the EU of supporting the anti-government rallies.

The EU “has totally lost the competence and qualifications needed for holding any kind of talks with Iran,” Iran’s chief of staff, Gen. Hasan Firouzabadi, was quoted as saying by the semiofficial Fars News Agency.

The EU struggled for a measured response as it prepared to debate a British request that all 27 member nations pull their envoys from Iran.

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